458 NEGRETTI AND ZAMBRA, HOLBORN VIADUCT, E.G., 



It is requisite frequently to clean out the battery when in constant use; 

 this is simply done by washing in plenty of water the cell, carbon, and 

 zinc (to remove all the yellow deposit), and then replace the elements, 

 with a fresh charge of Bi-Sulphate of Mercury. In handling this prepar- 

 ation great care should be taken to prevent it coming in contact with any 

 gold or silver articles, as the mercury would amalgamate with these metals, 

 and be very troublesome to remove ; in fact, delicate jewellery would be 

 utterly spoilt. Various shock handles and directors and flexible wires for 

 applying the galvanic current are supplied with each instrument. 



2783 Portable Medical Induction Coil (fig. 2782) . . . . 440 



2784 Cruikshank's Battery (see fig. 2519, page 428), for Medical use, where 



it is desirable to use the actual current without the interruption 

 of a coil 1 12 



2785 Induction Coil Apparatus, large size, similar to above, with Chloride of Silver 



and Zinc ; Battery, for Hospital use 6 10 



2786 Galvanic Cautery Battery, improved arrangement in Box, complete with 



Ecraseur, having Curved and Straight ends, Platinum Wire, &c., 



12 12 



HINTS FOR APPLYING MEDICAL GALVANISM.* 



2787 "1. Feeble powers should always be first tried; these should be gradually 

 augmented, and the use of such finally persisted in, as, without producing any 

 violent effects, appear to make a decided impression on the disease. 



" 2. Galvanism, as a remedial agent, must not be hastily given up because of its 

 beneficial effects not immediately appearing, for these, generally speaking, require 

 considerable time to be developed. 



" 3. Electricity or Galvanism should not be relied on exclusively in the treat- 

 ment of diseases, but should rather be considered as auxiliary to other methods 

 of cure. 



""": " 4. To the preceding we shall add, that in cases where the continuous current 

 may be deemed most advisable, it would be well to use batteries composed of plates 

 having an extended surface, there being reason to believe that the curative influence 

 of galvanism in this form depends, not upon its intensity, but upon the quantity 

 of it set in motion." 



To these principles we may add, that in all cases where it is necessary that the 

 interrupted current should be administered, the electro-magnetic coil machine will 

 be found much more manageable, much more portable, and equally powerful, if not 

 more so than the galvanic battery itself ; but in cases where the continuous current 

 is required, the battery alone should be used. 



Sig. Orrioli (an Italian Philosopher) recommends that before attempting to 

 apply Electricity therapeutically, we should study the nature of the secretions 

 produced, in order that we may be enabled to create in the secretory organ a proper 

 electrical state for bringing about contrary effects. These secretions will be Acid, 

 Alkaline, or Neutral. If they be acid or alkaline no difficulty will exist ; if they are 

 neutral, we should apply to the affected part the pole of the battery opposed to that 

 electrical state which belongs to the normal condition of this part. 



* G. T. Fisher's Medical Electricity. 



